We don't have synonyms for gilsland yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are island, Island and gilland.
(n) :
A village in England in Thirlwall parish, Northumberland and Upper Denton parish and Waterhead parish, Cumberland district, Cumbria, previously in City of Carlisle district (OS grid ref NY6366).
(n) :
A village in England in Thirlwall parish, Northumberland and Upper Denton parish and Waterhead parish, Cumberland district, Cumbria, previously in City of Carlisle district (OS grid ref NY6366).